Art of casting metal.



T. C. SCHULTZE.

ART OF CASTING METAL.

APPLICATION r1150 JULY 12. 1913- Patented July 4, 1916.

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Mfnessw g M T. c. SCHULTZE.

ART OF CASTING METAL.

APPLICATION FILED JULY 12. 1913. 1,189,391. Patented July 4, 1916.

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ART OF CASTING METAL.

Patented July 4, 1916.

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THEODORE C. SCHULTZE, OF GRAND RAPIDS, MICHIGAN, ASSIGNOR TO CHICAGO RAIL- WAY EQUIPMENT COMPANY. OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

ART or CASTING METAL.

Specification of Letters Patent.

Patented July 4, 1916.

Application filed July 12, 1913 SerialNo. 778,723.

To all whom it may concern:

Be it known that I, THEODORE C. SoH IL'rzE, a citizen of the United States, residing at Grand Rapids, Kent county, Michigan, have invented a certain new and useful Improvement in the Art of Casting Metal, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in wh1ch-- Figure 1 is a plan view of a pattern of a brake beam strut which I have selected as illustrating my invention. 1g. 2 1s a sectional view on line 22 of Fig. 1. Fig. 3 1s a side elevational view of the pattern shown in Fig. 1. Fig. 4 is an end View. Fig. 5 1s a detail view of a portion of the pattern showing how the same is parted. F1g. 6 is a sectional view on line 6-6 of Fig. 5. Fig. 7 1s a side elevational view of a removable portion of the pattern. Fig. 8 is an end elevational view of the same. Fig. 9 is a plan view of said removable portion of the pattern. Fig. 10 is a side elevational view of the cap or cover which forms one of the matrix walls in the molds Fig. 11 is an end elevational view of the same. Fig. 12 IS a plan view of the same. Fig. 13 is a sectional view showing the first step in mak ng a mold from the parts illustrated in Figs. 1 to 12. Fig. 11 is a similar view showing the second step in making a mold. Fig. 15 is a similar view showing the third step. Fig. 16

is a similar view showing the finished mold ready to receive molten metal.

This invention relates to a new and useful improvement in the art of casting metal, the object being to dispense with the use of baked cores which have heretofore been employed in castings made after the pattern illustrated, to wit, brake beam struts. Heretofore baked cores have been used to formmaking of a mold in which the brake lever slot in the strut is formed by the green sand constituting the mold, thus effecting a considerable saving in the cost of these castings.

IVhile I have illustrated my invention in connection with the casting of struts for brake beams, it is obvious that the same principle can be employed in the manufac-- ture of other castings, and, therefore, I do not wish to be understood as limiting my invention to the exact form. of pattern shown in the accompanying drawings or as making the castings of the particular shape hereinafter referred to.

In Figs. 1 and 3 I have shown the parts of the pattern assembled and these represent the form of the finished casting. This pat tern consists of a main member A, shown in Fig. 5, and a removable member B, the member A being provided with suitable seats to receive the end walls of the removable member B so as to properly locate the same: in the mold. .C is a cap or cover which is preferably a cast metal piece and which forms the shape of the molten metal at the outer surface of a strut opposite the brake lever slot. Each of the walls of the sections A and B are provided with core prints a and b for locating the cores which form the brake lever pin opening. The main member A of the pattern may also be provided with core prints (1' for locating the core which forms the wedge pin slot, which wedge pin locks the compression member of the brake beam in the eye of the strut.

Referring to Fig. 13, D indicates a portion of what is commonly designated the drag member of the flask, and M indicates what is known as the match part. This match part, which consists of any suitable material, has a portion of its upper surface shaped to conform to the outer contour of said pattern member A. In forming the mold, the pattern members A and B, properly assembled together, are arranged on this match part, as shown in Fig. 13. The drag member is then placed in position upon the match part and green sand, indicated at S, is tamped on the exposed surface of the match part and within the space between the pattern members A and B, to form the inner matrix walls for the brake lever slot in the casting. The sand is also tamped around the core prints a, a and b. After the sand has been thus tamped on the exposed portion of the match part, and between the pattern members A and B, as illustrated in Fig. 13, its upper surface forms a parting line indicated by p, which parting line I will hereinafter refer to as the false or drawing part. After the false parting line p is established, the section B of the pattern is drawn, and print 6 replaced by a suitable core. A matrix cap or cover C (see Fig. 12) is arranged over the space formerly occupied by section B of the pattern. This matrix cap or cover C is preferably a casting whose inner surface is shaped to form a matrix for one of the side walls of the strut casting. After the matrixcap C is arranged in position, its end .walls being shaped so as to engage the main pattern member A, the drag portion of the flask is rammed full of sand, so as to bury the matrix cap or cover C, as illustrated in Fig. 14. The matrix cap C remains thus in the sand until after the casting is made. The flask members comprising the match part M and drag member D are now inverted as shown in Fig. 15,v

after which the match part is lifted off of the drag, leaving the pattern member A in position on the drag. The removal of the match part establishes a new parting line 12', which is covered with a parting composltion. A suitable cope member CO may then be formed to replace the match part, the same being shaped by the parting line 2' and the outer surface of pattern part A. When the match part and cope are removed, the pattern member A is drawn, and prints a, a replaced by suitable cores. Then the cope member CO is positioned on the drag I as shown in Fig. 16. This completes the mold, the same being in the form illustrated in Fig. 16, and in readiness to be poured.

I have not shown any gates or vents in the mold, as these are well known in the art. It will be understood however that gates and vent openings will be located where desired.

I claim An improved method of forming a mold which consists in shaping interior matrix walls of friable material by means of suitable pattern members, suitably supporting said friable portions, withdrawing a pattern member from engagement with the friable material and disposing in proper relationship to the friable material a permanent matrix wall which is in part spaced apart from the friable material to provide a, portion of the mold cavity, supporting said friable and permanent matrix walls in proper relationship, withdrawing the remaining pattern portions, and disposing other suitable matrix walls in position to complete the mold cavity.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses, this first day of July, 1913.

THEO. C. SCHULTZE.

Witnesses:

Gno. H. VAN STEDUM, JOHN P. SEVEN. 

